It increases the magnification of the microscope 4X. Since the eyepiece already has 10X, looking through scan you will be seeing an image magnified 40X
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The scanning objective is used to quickly locate and focus on the specimen before switching to higher magnification objectives for detailed imaging. It typically has a low magnification (4x-10x) and a wide field of view to facilitate navigation and initial observations of the sample.
scanning objective
To click the scanning objective lens into place, adjust the fine focus knob until the image comes into focus. Then, turn the objective lens turret to the desired magnification and listen for a click indicating that the lens is locked. Finally, check the focus again to ensure the lens is securely in place.
to zoom in so you can see the microscopic features of e.g: bacteria
There are many different microscopes currently on the market. Most of these microscopes come with different levels of magnification so that you can view an object in different ways. It is important to make sure the microscope you choose to use will have the correct maginfication you need.
The scanning electron microscope (SEM) has the greatest depth of field compared to other objective lenses in optical microscopes. This is because the SEM uses a focused beam of electrons to create an image, allowing for a larger range of depths to be in focus simultaneously.